[Bug 162] New: GDC unable to de-virtualise method calls
d.gnu at puremagic.com
Sun Oct 26 03:37:29 PDT 2014
Bug ID: 162
Summary: GDC unable to de-virtualise method calls
Assignee: ibuclaw at gdcproject.org
Reporter: ibuclaw at gdcproject.org
Currently we emit method calls as the following:
*(c->__vptr + 40) (c, 1, 2, 3);
Which translate directly into the following trees:
indirect_ref(pointer_plus(component_ref(c, __vptr), 40))
GCC provides a more simplistic tree code called obj_type_ref, which represents
a virtual method lookup, and given the binfo structure we already pass to the
backed, this would give a chance for the optimiser passes to statically
determine the dynamic type of the object and devirtualise the call.
obj_type_ref(component_ref(c, __vptr), c, 40)
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